FILE - This April 12, 2012 file photo shows the clarity of Lake Tahoe near Incline Village, Nev. Climate change is changing the rules of nature scientists have followed for decades as they try to identify the causes of Lake Tahoe's loss of clarity and chart a course to restore the ecological health of the cobalt mountain waters dubbed the ''crown jewel'' of the Sierra. (AP Photo/Scott Sonner, File)
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